Amazing!!!! I had 3 Puffcos go bad on me and 1 blew up and almost caught my business on fire!!! That's when I made the switch to KANDYPENS. Right off the bat I loved the look and feel of it little did I know the surprise I was in for. Side by side this thing compared to puffco is hands down night and day!!! The Kandypens hit like a rig!!! Can't get any better than KANDYPENS!!!! Been using for 4 months now and not a single issue!!!